docs: def from_database(name: str, version: Optional[str] = None, manager: Optional[Manager] = None):
      """Load a BEL graph from a database.
  
      If name and version are given, finds it exactly with
      :meth:`pybel.manager.Manager.get_network_by_name_version`. If just the name is given, finds most recent
      with :meth:`pybel.manager.Manager.get_network_by_name_version`
  
      :param name: The name of the graph
      :param version: The version string of the graph. If not specified, loads most recent graph added with this name
      :return: A BEL graph loaded from the database
      :rtype: Optional[BELGraph]
      """
      if manager is None:
          manager = Manager()
  
      if version is None:
          return manager.get_graph_by_most_recent(name)
  
      return manager.get_graph_by_name_version(name, version)